Here's an excellent
FREE web site that's informational and a great motivator.
With any addiction, the end-result is completely up to you.
I smoked on-and-off for 28 years (much more "on" than "off"). I've been "off" this time for 3 months now. I won't say "quit" until I beat my 3-year record. Until then, I've only stopped.
You can do it! I concur with the link above, the first 72 hours are the worst. Beat those few hours and you can master it!
Regards,
Tom